JPH0161014B2 - - Google Patents
Info
- Publication number
- JPH0161014B2 JPH0161014B2 JP56117801A JP11780181A JPH0161014B2 JP H0161014 B2 JPH0161014 B2 JP H0161014B2 JP 56117801 A JP56117801 A JP 56117801A JP 11780181 A JP11780181 A JP 11780181A JP H0161014 B2 JPH0161014 B2 JP H0161014B2
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- magnetic
- rotor yoke
- rotor hub
- rotating shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000004907 flux Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 8
- 239000000696 magnetic material Substances 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/25—Devices for sensing temperature, or actuated thereby
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Brushless Motors (AREA)
Description
【発明の詳細な説明】
本発明は直流無刷子電動機、特に複数個の巻線
を備えた固定子鉄心に小空隙を介して対向配設し
た永久磁石を回転自在に軸支し、該永久磁石の回
転位置を検出する検出器を介して制御される通電
制御装置により上記複数個の巻線に順次通電し上
記永久磁石を備えた回転子を駆動するようにした
直流無刷子電動機の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a direct current brushless motor, in particular, a stator core equipped with a plurality of windings, in which a permanent magnet is rotatably supported opposite to a stator core with a small gap therebetween. This invention relates to an improvement in a direct current brushless motor in which the plurality of windings are sequentially energized by an energization control device controlled via a detector that detects the rotational position of the motor to drive the rotor equipped with the permanent magnets. It is.
本発明の直流無刷子電動機は、回転軸と、この
回転軸に固定した筒状回転子ハブと、上記回転軸
を回転自在に支持するため電動機基板に固定した
上記電動機基板の膨脹係数より小さな膨脹係数の
中空ブラケツトと、この中空ブラケツトの外周面
に固定した固定子鉄心と、この固定子鉄心に巻装
した複数個の固定子巻線と、上記固定子鉄心に小
空隙を介して対向配置せしめた円環状永久磁石
と、上記筒状回転子ハブの内周面に設けられその
内周面によつて上記円環状永久磁石をこの円環状
永久磁石の外端面を囲むよう保持する回転子ヨー
クと、上記永久磁石の回転位置を検出する検出器
と、上記回転子ヨークの外周面と上記回転子ハブ
の内周面との間に介挿した磁性材料製の薄板とよ
り成り、該薄板の磁気的特性は上記回転子ヨーク
の材料の磁気特性に比しより低い磁束密度におい
てより高い比透磁率を有することを特徴とする。 The DC brushless motor of the present invention includes a rotating shaft, a cylindrical rotor hub fixed to the rotating shaft, and an expansion coefficient smaller than the expansion coefficient of the motor board fixed to the motor board for rotatably supporting the rotating shaft. A hollow bracket with a coefficient, a stator core fixed to the outer peripheral surface of the hollow bracket, a plurality of stator windings wound around the stator core, and the stator core arranged opposite to each other through a small gap. a rotor yoke provided on the inner circumferential surface of the cylindrical rotor hub and holding the annular permanent magnet by the inner circumferential surface so as to surround the outer end surface of the annular permanent magnet; , a detector for detecting the rotational position of the permanent magnet, and a thin plate made of a magnetic material inserted between the outer circumferential surface of the rotor yoke and the inner circumferential surface of the rotor hub; The magnetic properties of the rotor yoke are characterized by higher relative magnetic permeability at lower magnetic flux density than the magnetic properties of the material of the rotor yoke.
以下図面によつて従来及び本発明の実施例を説
明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Conventional embodiments and embodiments of the present invention will be described below with reference to the drawings.
第１図は従来の直流無刷子電動機を示し１は回
転軸、２は磁気デスク（図示せず）を保持するた
め上記回転軸１の一端に連結した筒状回転子ハ
ブ、３は上記回転軸１の他端に固定した磁性材料
の回転子ヨーク、５はこの回転子ヨーク３に固定
した永久磁石、６は電動機基板、７は軸受１０，
１１を保持するため上記電動機基板６に設けた中
空ブラケツト、１２は両軸受１０，１１間に設け
た予圧用のバネ、１３は上記永久磁石５に対向し
て上記電動機基板６に固定た固定子鉄心、１４は
この固定子鉄心１３に巻回した固定子巻線、１５
は上記回転子ハブ２と電動機基板６間に設けたラ
ビリンスシール部、１６は通電制御用検出器の収
容部である。 FIG. 1 shows a conventional DC brushless motor, and 1 is a rotating shaft, 2 is a cylindrical rotor hub connected to one end of the rotating shaft 1 to hold a magnetic disk (not shown), and 3 is the rotating shaft. 1 is a rotor yoke made of a magnetic material fixed to the other end, 5 is a permanent magnet fixed to this rotor yoke 3, 6 is a motor board, 7 is a bearing 10,
12 is a preload spring provided between both bearings 10 and 11, and 13 is a stator fixed to the motor board 6 facing the permanent magnet 5. Iron core 14 is a stator winding wound around this stator core 13, 15
1 is a labyrinth seal portion provided between the rotor hub 2 and the motor board 6, and 16 is a housing portion for a detector for controlling energization.
第１図に示す電動機は回転軸１の一端に固着し
た回転子ハブ２の外周２−１に磁気デスクを嵌着
し、これを一定の高速度で回転させ該デスクの表
面に塗布した磁性微粉体上に構成した同心円状記
録媒体に磁化の状態の変化をあたえ、これにより
情報の記録又は読出しを行う磁気円板式記録装置
に使用するもので、その使用目的に適合するよう
に種々の動作上の規約が設けられている。 The electric motor shown in FIG. 1 has a magnetic disk fitted onto the outer periphery 2-1 of a rotor hub 2 fixed to one end of a rotating shaft 1, which is rotated at a constant high speed to coat the surface of the disk with magnetic fine particles. This device is used in magnetic disk recording devices that record or read information by changing the state of magnetization of a concentric recording medium constructed on a body. Terms and conditions have been established.
その規約の中で重要な項目として電動機から洩
れ磁束の制限がある。即ち電動機から洩れる磁束
でデスクに記録した情報が消えないように電動機
からの洩れ磁束を充分に小さくする必要があるの
で磁気デスクを取り付ける回転子ハブより電動機
部分を形成する部分、即ち永久磁石５、回転子ヨ
ーク３、固定子鉄心１３、固定子巻線１４を充分
に遠く離して取り付けるという構造となり第１図
のように電動機基板６を中心に両側に回転子ハブ
２と電動機部分を分けて装着する結果電動機全体
の長さが長くなり、容積が大きくなるという欠陥
があつた。 An important item in the regulations is the limit on magnetic flux leaking from the motor. That is, since it is necessary to sufficiently reduce the leakage magnetic flux from the electric motor so that the information recorded on the disk will not be erased by the magnetic flux leaking from the electric motor, the part forming the electric motor part, that is, the permanent magnet 5, is smaller than the rotor hub to which the magnetic disk is attached. The structure is such that the rotor yoke 3, stator core 13, and stator winding 14 are mounted sufficiently far apart, and the rotor hub 2 and the motor part are mounted separately on both sides of the motor board 6 as shown in Figure 1. As a result, the overall length of the electric motor became longer and the volume became larger.
又磁気デスクはかなりの高速例えば3600rpmで
回転せしめるのでデスクが空気と摩擦する為に生
ずる熱と電動機自体の発熱とにより電動機全体の
温度がかなり高くなり部分的に温度勾配が大きく
なり、温度上昇に伴い部材の部分的熱膨脹により
中空ブラケツト７が電動機基板６の面に対し垂直
とならなくなる結果軸受１０，１１を介して保持
した回転子ハブ２も傾斜し、回転子ハブ２に取り
付けた磁気デスクが水平面より傾き、該磁気デス
クに微小空隙を介して対向して配設された磁気検
出器（図示せず）との空隙寸法に変化を生じ誤動
作を生ずるという欠陥もあつた。 Also, since the magnetic desk rotates at a fairly high speed, for example, 3600 rpm, the temperature of the entire motor becomes quite high due to the heat generated by the friction of the desk with the air and the heat generated by the electric motor itself, and the temperature gradient becomes large in some parts, causing the temperature to rise. As a result of the partial thermal expansion of the associated members, the hollow bracket 7 is no longer perpendicular to the surface of the motor board 6, and as a result, the rotor hub 2 held via the bearings 10 and 11 also tilts, and the magnetic disk attached to the rotor hub 2 tilts. There was also a defect in that the magnetic disk was tilted from the horizontal plane, causing a change in the size of the gap between the magnetic desk and a magnetic detector (not shown) disposed opposite to the magnetic disk through a small gap, resulting in malfunction.
本発明は上に述べた従来の無刷子電動機の欠陥
を除き小形でかつ温度変化に対し安定な磁気デス
ク駆動用の無刷子電動機を提供するもので以下第
２図によりその実施例について説明する。 The present invention provides a brushless motor for driving a magnetic desk which is compact and stable against temperature changes, eliminating the drawbacks of the conventional brushless motors mentioned above, and an embodiment thereof will be described below with reference to FIG.
第２図は本発明に依る磁気デスク駆動用直流無
刷子電動機を示す断面図で、第１図と同一部分は
同一符号を付して示す。 FIG. 2 is a sectional view showing a DC brushless motor for driving a magnetic disk according to the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals.
本発明においては回転子ヨーク３を円環状とし
これを回転子ハブ２の内側面に配設すると共にこ
の回転子ヨーク３の内側面外端３−１を内方に突
出せしめこの部分で同じく円環状の永久磁石５を
挾持せしめるようにする。又回転子ハブ２の内側
面と回転子ヨーク３の外周面間に磁性材料製の薄
板４を介挿し、上記円環状永久磁石５に対向する
固定子鉄心１３を中空ブラケツト７の外周面に固
着する。 In the present invention, the rotor yoke 3 is annular and is disposed on the inner surface of the rotor hub 2, and the outer end 3-1 of the inner surface of the rotor yoke 3 is made to protrude inwardly. An annular permanent magnet 5 is held between the magnets. Further, a thin plate 4 made of a magnetic material is inserted between the inner surface of the rotor hub 2 and the outer circumferential surface of the rotor yoke 3, and the stator core 13 facing the annular permanent magnet 5 is fixed to the outer circumferential surface of the hollow bracket 7. do.
本発明による第２図の構成と従来技術による第
１図の構成を比較すると、第１図では電動機部分
を筒状回転子ハブ２から遠く離れた位置に取り付
けてあるのに対し第２図では電動機部分を筒状回
転子ハブ２の内側空間内に配設してあるので第１
図の従来構成に比し軸方向の長さを短縮すること
ができる。又本発明においては第２図の構成にし
た結果電動機部分が回転子ハブの外周に装着され
た磁気デスクに接近し、電動機部分からの洩れ磁
束が上記磁気デスクに作用し磁気デスク内に記録
されている情報を消滅させる虞れがあるがこの洩
れ磁束は磁性材料製回転子ヨーク３の内側面外端
３−１を内方に突出し永久磁石５の端面に沿つて
半径方向に張り出し、又上記回転子ヨーク３の外
周面と上記回転子ハブ２の内周面との間に磁性材
料製の薄板４を回転子ヨーク３の外周全体を覆う
ように配設してあるので十分低減される。即ち永
久磁石５の端面より軸方向に洩れる磁束は回転子
ヨークの内側面外端３−１で吸収され又回転子ヨ
ーク３の外周面から半径方向外方に洩れる磁束は
磁性薄板４で吸収され電動機部分より磁気デスク
方向への洩れ磁束は十分低減される。 Comparing the configuration of FIG. 2 according to the present invention with the configuration of FIG. 1 according to the prior art, it is found that in FIG. Since the electric motor part is disposed within the inner space of the cylindrical rotor hub 2, the first
The length in the axial direction can be shortened compared to the conventional configuration shown in the figure. In addition, in the present invention, as a result of the configuration shown in FIG. 2, the electric motor portion approaches the magnetic disk mounted on the outer periphery of the rotor hub, and leakage magnetic flux from the electric motor portion acts on the magnetic disk and is recorded in the magnetic disk. This leakage magnetic flux may cause the inner surface outer end 3-1 of the rotor yoke 3 made of a magnetic material to protrude inwardly and extend in the radial direction along the end surface of the permanent magnet 5. Since the thin plate 4 made of a magnetic material is disposed between the outer circumferential surface of the rotor yoke 3 and the inner circumferential surface of the rotor hub 2 so as to cover the entire outer circumference of the rotor yoke 3, it is sufficiently reduced. That is, the magnetic flux leaking in the axial direction from the end face of the permanent magnet 5 is absorbed by the outer end 3-1 of the inner surface of the rotor yoke, and the magnetic flux leaking outward in the radial direction from the outer peripheral surface of the rotor yoke 3 is absorbed by the magnetic thin plate 4. Leakage magnetic flux from the motor portion toward the magnetic desk is sufficiently reduced.
尚、実験の結果上記のような構成にしても磁束
密度の低いとき回転子ヨーク３の外周面から半径
方向に漏れる磁束の吸収が不充分であることが判
明した。従つて種々実験研究の結果下記のように
することが好ましい結果の得られることが判明し
た。即ち本発明においては上記薄板４の磁気特性
は回転子ヨーク３を構成する磁性材料に比し、よ
り低い磁束密度に於いてより高い比透磁率を有す
る材料とする。例えば回転子ヨーク３の材料を電
磁用軟鉄又は冷延鉄板等とするのに対し薄板４の
材料はパーマロイ又は方向性珪素鋼帯等を使用し
これを回転子ヨーク３の外周に複数回巻装するの
が好ましい。 As a result of experiments, it has been found that even with the above configuration, absorption of the magnetic flux leaking in the radial direction from the outer peripheral surface of the rotor yoke 3 is insufficient when the magnetic flux density is low. Accordingly, as a result of various experimental studies, it has been found that preferable results can be obtained by doing the following. That is, in the present invention, the magnetic properties of the thin plate 4 are made of a material having a higher relative magnetic permeability at a lower magnetic flux density than that of the magnetic material constituting the rotor yoke 3. For example, the material of the rotor yoke 3 is electromagnetic soft iron or cold-rolled iron plate, while the material of the thin plate 4 is permalloy or grain-oriented silicon steel strip, which is wound around the outer periphery of the rotor yoke 3 multiple times. It is preferable to do so.
更に上記中空ブラケツト７は電動機基板６に比
し膨脹係数の小さな材料で構成し上記電動機基板
６のほぼ中心部に垂直に植設固着するのが好まし
い。即ち上記電動機基板６の材料をアルミニユー
ムを主材とした合金とした場合、上記中空ブラケ
ツト７の材料を黄銅又は鉄及び鉄合金で構成す
る。このようにすれば中空ブラケツト７の膨脹係
数は電動機基板６に比しその約1/2となり、温度
上昇に依り中空ブラケツト７の内径と軸受１０と
１１の外径との差が小さくなりこの結果回転軸１
の傾きが減り回転子ハブ２で保持される磁気デス
クの傾きが僅少となる効果がある。 Further, it is preferable that the hollow bracket 7 is made of a material having a smaller coefficient of expansion than the motor board 6, and is fixedly implanted vertically in substantially the center of the motor board 6. That is, when the material of the motor board 6 is an alloy mainly made of aluminum, the material of the hollow bracket 7 is made of brass or iron and an iron alloy. In this way, the expansion coefficient of the hollow bracket 7 will be approximately 1/2 that of the motor board 6, and as the temperature rises, the difference between the inner diameter of the hollow bracket 7 and the outer diameter of the bearings 10 and 11 will become smaller. Rotating axis 1
This has the effect that the inclination of the magnetic disk held by the rotor hub 2 is reduced.
第１図は従来より実施されている磁気デスク駆
動用の直流無刷子電動機の断面図、第２図は本発
明に係る直流無刷子電動機の一実施例を示す断面
図である。
１……回転軸、２……回転子ハブ、３……回転
子ヨーク、４……薄板、５……永久磁石、６……
電動機基板、７……中空ブラケツト、１０，１１
……軸受、１３……固定子鉄心、１４……固定子
巻線、１５……ラビリンスシール部、１６……収
容部。
FIG. 1 is a sectional view of a conventional DC brushless motor for driving a magnetic disk, and FIG. 2 is a sectional view showing an embodiment of the DC brushless motor according to the present invention. 1...Rotating shaft, 2...Rotor hub, 3...Rotor yoke, 4...Thin plate, 5...Permanent magnet, 6...
Motor board, 7...Hollow bracket, 10, 11
... bearing, 13 ... stator core, 14 ... stator winding, 15 ... labyrinth seal section, 16 ... accommodation section.
Claims (1)
ハブと、上記回転軸を回転自在に支持するため電
動機基板に固定した上記電動機基板の膨脹係数よ
り小さな膨脹係数の中空ブラケツトと、この中空
ブラケツトの外周面に固定した固定子鉄心と、こ
の固定子鉄心に巻装した複数個の固定子巻線と、
上記固定子鉄心に小空隙を介して対向配置せしめ
た円環状永久磁石と、上記筒状回転子ハブの内周
面に設けられその内周面によつて上記円環状永久
磁石をこの円環状永久磁石の外端面を囲むよう保
持する回転子ヨークと、上記永久磁石の回転位置
を検出する検出器と、上記回転子ヨークの外周面
と上記回転子ハブの内周面との間に介挿した磁性
材料製の薄板とより成り、該薄板の磁気的特性は
上記回転子ヨークの材料の磁気特性に比しより低
い磁束密度においてより高い比透磁率を有するこ
とを特徴とする直流無刷子電動機。 ２ 上記回転子ヨークの内周面外端を上記永久磁
石の端面に沿つて半径方向内方に張り出した特許
請求の範囲第１項記載の直流無刷子電動機。[Scope of Claims] 1. A rotating shaft, a cylindrical rotor hub fixed to the rotating shaft, and a rotor hub having an expansion coefficient smaller than that of the motor board fixed to the motor board for rotatably supporting the rotating shaft. A hollow bracket, a stator core fixed to the outer peripheral surface of the hollow bracket, a plurality of stator windings wound around the stator core,
An annular permanent magnet disposed opposite to the stator core with a small gap therebetween; and an annular permanent magnet provided on the inner peripheral surface of the cylindrical rotor hub. A rotor yoke that holds the outer end surface of the magnet, a detector that detects the rotational position of the permanent magnet, and a detector that is inserted between the outer circumferential surface of the rotor yoke and the inner circumferential surface of the rotor hub. 1. A direct current brushless motor comprising a thin plate made of a magnetic material, wherein the magnetic properties of the thin plate have a higher relative magnetic permeability at a lower magnetic flux density than the magnetic properties of the material of the rotor yoke. 2. The direct current brushless motor according to claim 1, wherein the outer end of the inner circumferential surface of the rotor yoke extends radially inward along the end surface of the permanent magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56117801A JPS5822571A (en) | 1981-07-29 | 1981-07-29 | Dc brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56117801A JPS5822571A (en) | 1981-07-29 | 1981-07-29 | Dc brushless motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5822571A JPS5822571A (en) | 1983-02-09 |
| JPH0161014B2 true JPH0161014B2 (en) | 1989-12-26 |
Family
ID=14720610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56117801A Granted JPS5822571A (en) | 1981-07-29 | 1981-07-29 | Dc brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5822571A (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5216557A (en) * | 1981-09-07 | 1993-06-01 | Papst-Motoren Gmbh & Co. Kg | Disk storage device having a brushless dc drive motor |
| USRE37058E1 (en) | 1980-05-10 | 2001-02-20 | Papst Licensing Gmbh & Co. Kg | Disk storage device having contamination seals |
| DE3419814C1 (en) * | 1984-05-26 | 1985-11-28 | GMN Georg Müller Nürnberg GmbH, 8500 Nürnberg | Motor spindle for magnetic disk storage |
| JPH0782699B2 (en) * | 1984-06-01 | 1995-09-06 | パプスト ライセンシング ゲーエムベーハー | Disk drive |
| JPS61477U (en) * | 1984-06-01 | 1986-01-06 | 日本電気精器株式会社 | Spindle motor for magnetic disk |
| JPS61476U (en) * | 1984-06-01 | 1986-01-06 | 日本電気精器株式会社 | Spindle motor for magnetic disk |
| JPH01129745A (en) * | 1987-11-12 | 1989-05-23 | Matsushita Electric Ind Co Ltd | Motor for disk drive unit |
| FR2625048B1 (en) * | 1987-12-16 | 1990-06-01 | Aerospatiale | HIGH EFFICIENCY ELECTRIC MOTOR WITH LOW TORQUE RIPLE |
| JP2662413B2 (en) * | 1988-04-12 | 1997-10-15 | 昭和電工株式会社 | Method for producing vapor grown carbon fiber |
| JP3133224B2 (en) * | 1994-12-27 | 2001-02-05 | 財団法人鉄道総合技術研究所 | Permanent magnet excitation synchronous motor for vehicles |
| AU2383297A (en) * | 1997-04-01 | 1998-10-22 | Papst Licensing Gmbh | Disk storage device with improved spindle torque and acceleration |
| AU2635597A (en) * | 1997-04-01 | 1998-10-22 | Papst Licensing Gmbh | Disk storage device with improved spindle torque and acceleration |
| JP4175417B2 (en) * | 2006-11-06 | 2008-11-05 | ダイキン工業株式会社 | Outer rotor motor and manufacturing method thereof |
-
1981
- 1981-07-29 JP JP56117801A patent/JPS5822571A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5822571A (en) | 1983-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2559138Y2 (en) | Spindle motor assembly | |
| JP2586305Y2 (en) | Magnetic disk drive motor | |
| US5195002A (en) | Apparatus for driving information record medium | |
| JPH0161014B2 (en) | ||
| KR930700999A (en) | Quiet Spin Motors for Disk Drives | |
| JPH0583913A (en) | Spindle motor for magnetic disk device | |
| US5400197A (en) | Disc drive spindle motor | |
| US5093595A (en) | Spindle motor having reduced torque ripple | |
| US6876114B2 (en) | Apparatus for reducing spindle motor magnetic drag | |
| US5726829A (en) | Axial spindle motor for hard disk drive assembly | |
| JP3708898B2 (en) | Disk rotation motor and disk device | |
| JPH09149586A (en) | Spindle motor | |
| JPH06124533A (en) | Magnetic disk driving motor | |
| JPS60121955A (en) | Dc brushless motor | |
| JPH04161033A (en) | Spindle motor | |
| JP2729733B2 (en) | Magnetic disk drive motor | |
| JP2601014B2 (en) | Electric motor | |
| JPH05342778A (en) | Housing of head support arm and head-disk assembly using the same | |
| JP2523299Y2 (en) | Disk drive | |
| JP2542786B2 (en) | Rotation drive mechanism of disk recording medium | |
| JPH04172951A (en) | Motor | |
| JPH05347066A (en) | Magnetic disk device | |
| JPH0510549Y2 (en) | ||
| JP3469601B2 (en) | motor | |
| JPH0540701Y2 (en) |